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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2019-11-12 10:19:52 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-11-13 15:20:25 +0100 |
| commit | 2d67f7865213168df528ed3a7e0ddf029f393e62 (patch) | |
| tree | 6cc406d2f4d7117b5eea933e8edeb9f081b326ce | |
| parent | 76f136ddde15039b9b63f089da96905e68fe18c4 (diff) | |
| download | barebox-2d67f7865213168df528ed3a7e0ddf029f393e62.tar.gz barebox-2d67f7865213168df528ed3a7e0ddf029f393e62.tar.xz | |
Documentation: boards: stm32mp: document boot error LED
The STM32MP Evaluation Kits place a LED on PA13 to display boot status.
Document its blinking patterns.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | Documentation/boards/stm32mp.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index f93ec04eb0..6d97b0d6d4 100644 --- a/Documentation/boards/stm32mp.rst +++ b/Documentation/boards/stm32mp.rst @@ -81,3 +81,13 @@ pulled down and BOOT0 and BOOT2 are connected to a 2P DIP switch:: BOOT2 | O --O | BOOT0 | N --O | <---- DFU on UART and USB OTG +-------+ + +Boot status indicator +--------------------- + +The ROM code on the first Cortex-A7 core pulses the PA13 pad. +An error LED on this pad can be used to indicate boot status: + +* **Boot Failure:** LED lights bright +* **UART/USB Boot:** LED blinks fast +* **Debug access:** LED lights weak |